Release 1.0
Technical Documentation 01/2006
TD_Repair_L3_SXG75_R1.0.pdf Page 46 of 73
Charging circuit elements controlled by the PM6650
The following signals are involved in the battery charging process:
Signal Function
POWER This is the supply connection to the accessory connector.
CHG_CNT_N
Drive signal from PM6650. The control for the pass transistor, V1100. Low
voltage turns on the transistor.
ICHARGE
Positive current sensor input to PM6650. Used to generate feedback
signal for CHG_CNT_N control.
ICHARGEOUT
Negative current sensor input to PM6650. Used to generate feedback
signal for CHG_CNT_N control. Note this is the same signal as
VPH_PWR - the main supply for the phone circuitry.
BATT_FET_N
Drive signal from PM6650. The control for the battery switch MOSFET,
V1102. Low voltage turns on the MOSFET.
VBATT
Battery voltage monitored by PM6650.
This line is also used to trickle charge the battery when it has very low
voltage.
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2006©BenQ
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